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Sorry about the confusion... Its a self build bungalow and I'm trying to do most of the work myself. The attic area will be part of the living space, and as such I'm insulating the roof according to Bldg Regs. ie 50mm air gap under the felt then 100mm celotex inbetween rafters and 50mm celotex...

Hi, New build bungalow with attic trusses. I'm installing 100mm celotex between the rafters and 50mm celotex sheet on the underside. Shall I carry this on over the small ceiling area or just plasterboard it and lay down fibreglass quilt on top. I assume 150mm celotex would have better...